package edu.zjut.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@WebServlet(name = "LogoutServlet", urlPatterns = { "/logout.do" })
public class LogoutServlet extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		HttpSession session = request.getSession(false);
		if (session == null) {
			response.sendRedirect("index.jsp");
			return;
		}
		session.removeAttribute("user");
		session.invalidate();
		response.sendRedirect("index.jsp");
	}
}